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A092994 Smallest prime of the form concatenation of prime(n) with itself followed by a 7, or 0 if no such prime exists. 4
227, 37, 557, 0, 11117, 137, 17171717171717171717171717171717171717171717171717177, 197, 23232323232323237, 29297, 317, 0, 41414141414141414141414141414141414141414141417 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(12)=0 since the concatenation of 37 with itself, followed by a 7, is always composite. a(14), the term relative to 43, is a prime with 1089 digits. - Giovanni Resta, Apr 07 2006

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Cf. A092992, A092993, A092995.

Sequence in context: A251500 A050847 A098247 * A031513 A078765 A179141

Adjacent sequences:  A092991 A092992 A092993 * A092995 A092996 A092997

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Mar 28 2004

EXTENSIONS

More terms from Giovanni Resta, Apr 07 2006

STATUS

approved

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Last modified November 19 08:44 EST 2019. Contains 329318 sequences. (Running on oeis4.)